1. Consider the following code from React Router. What do you call :id in the path prop? > Route path=”/:id” / >

2. Which of the following is used in React.js to increase performance?

3. How do you destructure the properties that are sent to the Dish component?

  function Dish(props) {
  return (

{props.name} {props.cookingTime}

);

4. What will be the output of the following code?

import React, { Component } from 'react';  
const App = () => {  
    
      return(  
          < div >  
             < h1 className = "hello" > {25+20}< /h1 >   
          < /div >  
      );   
}  
export default App;

5. What happens when the following render() method executes?

render(){
   let langs = ["PHP","ES6","JAVA"]
     return ( < div>
       {langs.map(it =>  < p > {it}  < /p > )}
      < /div > )
 }

6. What will happen if you render an input element with disabled = {false}?

7. What do you call a React component that catches JavaScript errors anywhere in the child component tree?

8. How many stages are there in React js life cycle

9.  What is the use of React hooks?

10. How do you set a default value for an uncontrolled form field?

11. What is the use of “webpack” command in React.js?

12. What are the limitations of ReactJS?

13. Which of the following are the advantages of React.js?

14. Which attribute is React’s replacement for using innerHTML in the browser DOM?

15. React can only render elements in the root document element.